Protecting furnaces.



A. ALLEN. PROTECTING FURNACES. APPLICATION FILED MAR. 14, 1908.

918,941 Patented Apr. '20, 1909.

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WITNESSES INVENTO R was, Wm

A. W. ALLEN.

PROTEGTING FURNACES.

APPLICATION rum) MAR.14. 190a.

Patented Apr. 26, 1909.

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1 I I l WITNESSES A. W. ALLEN.

PROTECTING FURNACES.

uwmornon FILED 1411.14, 1908.

91 8, 941 Patented Apr. 20, 1909. a sums-sums.

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ANSON W. ALLEN, OF PENOOYD, PENNSYLVANIA.

PROTECTING FURNACE S.

' Specification of Letters latent.

Patented April 20, 1909.

Application filed March 14, 1908. Serial No. 421,132.

To all whom it may concern:

Be it known that I, ANsoN W. ALLEN, a citizen of the United States ofAmerica, re siding at Pencoyd, in the county of Montgomery and State ofPennsylvania, have invented a new and useful Improvement for ProtectinFurnaces, of which the following is a speci ication, reference being hadto the accompanying drawings, forming part of this specification, inwhich--- Figure 1 is a partial longitudinal vertical section of acontinuous heating furnace constructed in accordance with my invention;Figs. 2 and 3 are respectively a vertical crosssection and aiartialhorizontal section on the lines II--I and IIIIII respectively ofFig. 1; Fig. 4 is a sectional plan of a soaking pit constructed inaccordance with my invention; and Fig. 5 is a vertical cross-sectioncoolin channels either in the hearth or walls,

or bot 1, thereby chilling the slag adjacent to these channels to rovidea protecting layer and revent splas ing of the sla In the rawings,referring to the form of Figs. 1 to 3, 2 represents t e hearth, 3 theside walls, 4. the slag outlet, and 5 the roof of an ordinary contmuousheating furnace. The usual skid pi es 6 are employed, which extend fromthe c arging end .of the furnace up to the hearth 2.

With the ordinary construction, the billets dro ofl the end portions ofthe Water-cooled ski pi es and fall on the hearth, splashing the cinderwhich forms thereon. This cinder acts to cut out the hearth and sidewalls rapidly, and to avoid this I embed in that ortion of the'hearthwhich receives the bil ets,

cooling pipes 7. These pipes may extend through the side wall of thefurnace and be connected to any suitable source of suppl and outlet forcontinuous circulation of coo ing water. I have shown the pipe asU.-shaped for this purpose.- I have also shown the hearth as slopingtoward one side so that the sla drip ing from the blanks may pass out troug the slag spout 8, as shown in Fig. 2. I have also shown a similarcooling pipe system 9 in the brid e wall 10 of the furnace, whereby thebri ge wall is cooled to prevent its being fused by the intense heat.

In Figs. 4 and 5, I show the cooling pipes '11 arranged in the sidewalls 12- of a soaking it furnace in the portion adjacent to theiiearth. I also show pipes 13 located in the hearth of the furnace. Inthis case the slag is as liable to attack the lower parts of the sidewalls as it is to attack the floor or hearth, and consequently I protectthese walls, in addition to protecting the hearth. The pipes may bearranged either in the sidewalls or in the floor, hearth, or both, andin all cases they act to chill the slag either by contact or convexion.

The chilled slag forms a protective layer covering, which reventsfurther destruction of the walls or earth and to some extent actuallyreplaces the lining which may be already destroyed. As more slag isformed;

which forms further layers or accretions, and by regulating the chillineffect, I can regu-' late the thickness of thedayer.

The advantages of my invention will be apparent to those'skilled in theart, since con- Sl erable time and expense of repairing hearths andwalls is avoided. A protective layer may be formed of any desirablethicknessby regulating the chilling action.

Many changes ma be made in theform and arrangement oft e coolingchannels, and they may be em loyed in furnaces of any desirable type witout departing from my invention.

I claim I 1. A heating furnace having a refractory hearth, coolingchannels located in its side walls and hearth, arranged to chill theslag and form a protective covering for the hearth, said hearth having aslope to one side and a slag dischar e at the lower side of the hearth;substantia 1y as described.

2. A heating furnace having a refractory hearth provided withtransversely extending cooling channels arranged to chill the slag andform a protective covering for the hearth, said hearth havin a slope toone side,

and a slag discharge at t e lower side of the hearth, substantia 1y asdescribed.

In testimony whereof, I have hereunto set my hand.

ANSON w. ALLEN.

Witnesses:

THOMAS S. NnLsoN, ANNIE I. NELSON.

